MM-12849 Moving all non request scoped items to Server struct (#9806)

* Moving goroutine pool

* Auto refactor

* Moving plugins.

* Auto refactor

* Moving fields to server

* Auto refactor

* Removing siteurl duplication.

* Moving reset of app fields

* Auto refactor

* Formatting

* Moving niling of Server to after last use

* Fixing unit tests.

app/user.go

@@ -1034,14 +1034,14 @@ func (a *App) UpdateUser(user *model.User, sendNotifications bool) (*model.User,
 
 	if sendNotifications {
 		if rusers[0].Email != rusers[1].Email {
-			a.Go(func() {
+			a.Srv.Go(func() {
 				if err := a.SendEmailChangeEmail(rusers[1].Email, rusers[0].Email, rusers[0].Locale, a.GetSiteURL()); err != nil {
 					mlog.Error(err.Error())
 				}
 			})
 
 			if a.Config().EmailSettings.RequireEmailVerification {
-				a.Go(func() {
+				a.Srv.Go(func() {
 					if err := a.SendEmailVerification(rusers[0]); err != nil {
 						mlog.Error(err.Error())
 					}
@@ -1050,7 +1050,7 @@ func (a *App) UpdateUser(user *model.User, sendNotifications bool) (*model.User,
 		}
 
 		if rusers[0].Username != rusers[1].Username {
-			a.Go(func() {
+			a.Srv.Go(func() {
 				if err := a.SendChangeUsernameEmail(rusers[1].Username, rusers[0].Username, rusers[0].Email, rusers[0].Locale, a.GetSiteURL()); err != nil {
 					mlog.Error(err.Error())
 				}
@@ -1090,7 +1090,7 @@ func (a *App) UpdateMfa(activate bool, userId, token string) *model.AppError {
 		}
 	}
 
-	a.Go(func() {
+	a.Srv.Go(func() {
 		user, err := a.GetUser(userId)
 		if err != nil {
 			mlog.Error(err.Error())
@@ -1133,7 +1133,7 @@ func (a *App) UpdatePasswordSendEmail(user *model.User, newPassword, method stri
 		return err
 	}
 
-	a.Go(func() {
+	a.Srv.Go(func() {
 		if err := a.SendPasswordChangeEmail(user.Email, method, user.Locale, a.GetSiteURL()); err != nil {
 			mlog.Error(err.Error())
 		}